Apparatus for manufacturing compound castings



Feb. 2, 1932.

K. ACKERMANN APPARATUS FOR MANUFACTURING COMPOUND CASTINGS File'd Oct.11. 1950 Patented Feb. 2, 1932 KARL ACKERMANN, 0F IBOCHUM, GERMANYAPPARATUS FOR MANUFACTURING COMPOUND CASTINGS Application flledoctober11, 1930, Serial No. 487,953, and in Germany March 19, 1929.

My invention relates to improvements in the method of and an apparatusfor manufacturing compound castings, such for example as compound steelingots used for manufacturing rails in which the head has a higherstrength or hardness than the web and the foot. More particularly myinvention relates to the method in which one or more plates of sheetmetal similar in character to the metal to be cast are placed into themold or ingot before casting the metal into the same, the said late orplates preventing the metals of di erent composition from interminglingwhen being cast, and being combinedwit the metal by welding or bymelting. It has been found that the metals are not always thoroughlycombined near the outer surface, so that cracks are formed in the outerparts of the casting, which cracks must be closed by welding.

The object of the improvements is to provide a method in which theformation of such cracks is avoided. I have found that the cracks areproduced by the cooling of the metal near the wall of the mold, thetemperature of the metal being reduced so that welding or melting of thesheet metal placed into 7 the same is im ossible. Therefore my inventionconsists in disposing the sheet metal plates so that the amount of heatacting on the outer margins thereof is increased, and

for this purpose the sheet metal plates are disposed at a greaterdistance at their outer parts than at their inner parts, and the platesare reduced in thickness at their outer parts.

For the pur ose of explainin the invention a mold and two perforatedplates located therein have been shown in the accompanyin' d awings, inwhich ig. 1 is a sectional plan view showing a pair of perforatedplates, and Fig. 2 is a sectional plan view showing an ingot having thesaid plates located therein.

In the example shown in the drawings the metal is cast in a mold a, andtwo perforated plates 6 and c are set into the said mold. Both platesare reduced in thickness at their outer ends as is shown at d, and thesaid ends are bent outwardly and away fromthe said plates b, c.

In the manufacture of the casting the metals of different compositionare simultaneously cast into the sections 0 and f of the mold, and thesaid metals floW together through the perforations of the plates 6 and0. During the casting operation the plates b and'o prevent interminglingof the metals, but they are combined with the metal by welding ormelting.

I claim:

In apparatus of the character described having a mold for castingcomposite rail ingots, and a plurality of spaced-apartvertically-disposed perforated fusible plates extending the width ofsaid mold, the improvement consisting of perforated plates having theirmarginal ends curved outwardly and taperingly drawn forward to provideenlarged marginal end portions of a casting chamber between said plates,whereby the rate of cooling of the cast mass of metal at said endportions is relatively slower than that of the mass at the centralportion of the chamber thereof.

In testimony whereof I hereunto aflix my signature.

KARL AGKERMANN.

